Stated by many writers and George Lucas himself, becoming a Force Spirit is actually the most powerful ability. The end works in a mysterious way in the Star Wars universe. When somebody passes away, they lose their consciousness and individuality to become part of the Force itself.

However, a Jedi, such as Qui-Gon, can achieve true immortality through the exultation of self, not the centering of it. Something the Sith ultimately never attain. Qui-Gon was the first Jedi to achieve this since ancient times, due to him being a maverick of the Jedi before the prequels. The afterlife is pretty empty in Star Wars, and even Yoda himself still teaches in the netherworld of the Force for newcomers to arrive there.

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Working overtime to uncover the mysteries of existence(as described by Onyx)I have come into being like Set, the Separator who contends against Osiris for Eternity.

I know some pretty dark deities from the Pokemon universe, but not sure whether any of them fits the bill.

But I wanted to make a list of them anyway

YveltalGod of destruction and death. Counterpart to Xerneas, the god of life (well, there's also a third, Zygarde, god of the balance between life and death, i.e. the ecosystem).

HoopaThe trickster. 'nuff said.

NecrozmaDarkness. Originally was "the blinding/radiant one" but lost its ability to create light and now feeds on the light of other worlds, depriving them of it.

DarkraiBringer of nightmares.Mainly its defense mechanism, but might also feed on them (and wouldn't be the only one, there's quite a bunch of nightmare-feeders and fear-feeders among non-divine Pokemon).

Not really dark but still worth mentioning:

Solgaleo is fun. It's a lion with a sun-like face, from all its symbolism "monotheistic solar-creator-deity" par excellence.But it's epithet? "The beast that devours the sun". Still pretty much a sun-spirit, though.

"The voice of life", incarnated as a Hydreigon (three-headed dragon). The player character supports it against the apocalypse. In the beginning of the story, it first seems to be the bad guy.

GiratinaRuler of a kind of parallel universe, representing antimatter.

Resihram and ZekromYin and yang, or idealism and truth, basically the opposing twins.Kyurem is the balance between or absence of them, representing wuji. In one of the games, it can foresee the future and protects fate even if that would lead to the end of the world.

Non-deities (well, the line's blurry anyway) but still mythical enough:Mewtwo - your typical antihero. Kinda represents the negative aspects of human "separateness from nature" by being a human creation and needing to find its place in the world.

Lucario - an Anubis-like being with psychic abilities. One Lucario is the guardian of the Tree of Life in the movie where it's a main character.

Most others of the deities are basically nature spirits (e.g. representing the continents or oceans or weather phenomena) or stand for other aspects of reality (e.g. time and space, or mind, emotions and will).